Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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The Effect of Passing Aged Years to the Polarization Characteristics of Embedded Steel Bar of Mortar Specimen(W/C:0.4)

몰타르 시험편(W/C:0.4) 내부철근의 분극특성에 미치는 재령년수의 영향

  • Moon, Kyung-Man (Dept. of Marine Equipment Engineering, Korea Maritime and Ocean Univ.) ;
  • Won, Jong-Pil (Dept. of Marine Equipment Engineering, Korea Maritime and Ocean Univ.) ;
  • Park, Dong-Hyun (Dept. of Marine Equipment Engineering, Korea Maritime and Ocean Univ.) ;
  • Lee, Sung-Yul (Dept. of Marine Equipment Engineering, Korea Maritime and Ocean Univ.) ;
  • Jeong, Jin-A (Dept. of Marine System Engineering, Korea Maritime and Ocean Univ.) ;
  • Lee, Myeong-Hoon (Dept. of Marine System Engineering, Korea Maritime and Ocean Univ.) ;
  • Baek, Tae-Sil (Dept. of Steel Industry, Pohang College)
  • 문경만 (한국해양대학교 공대 조선기자재공학부) ;
  • 원종필 (한국해양대학교 공대 조선기자재공학부) ;
  • 박동현 (한국해양대학교 공대 조선기자재공학부) ;
  • 이성열 (한국해양대학교 공대 조선기자재공학부) ;
  • 정진아 (한국해양대학교 해사대학 기관시스템 공학부) ;
  • 이명훈 (한국해양대학교 해사대학 기관시스템 공학부) ;
  • 백태실 (포항대학교 제철산업과)
  • Received : 2014.01.11
  • Accepted : 2014.02.24
  • Published : 2014.02.28
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Abstract

The structures of reinforced concrete has been extensively increased with rapid development of industrial society. Futhermore, these reinforced concretes are easy to expose to severe corrosive environments such as sea water, contaminated water, acid rain and seashore etc.. Thus, corrosion problem of inner steel bar embedded in concrete is very important in terms of safety and economical point of view. In this study, multiple mortar test specimen(W/C:0.4) with six types having different cover thickness each other was prepared and was immerged in seawater solution for five years to evaluate the effect of cover thickness and immersion years to corrosion property of embedded steel bar. And the polarization characteristics of these embedded steel bars was investigated using electrochemical methods such as measuring corrosion potential, cathodic polarization curve, and cyclic voltammogram. At the beginning of immersion, the corrosion potentials exhibited increasingly nobler values with increasing cover thickness. However, after immersed for 5 years, the thicker cover of thickness, the corrosion potentials shifted in the negative direction, and the relationship between corrosion potential and cover thickness was not in good agreement with each other. Therefore, it is considered that the thinner cover of thickness, corrosive products deposited on the surface of the embedded steel bar plays the role as a resistance polarization which is resulted in decreasing the corrosion rate as well as shifting the corrosion potential in the positive direction. As a result, it seemed that the evaluation which corrosion possibility of the reinforced steel would be estimated by only measuring the corrosion potential may not be a completely desirable method. Therefore, it is suggested that we should take into account various parameters, including cover thickness, passed aged years as well as corrosion potential for more accurate assessment of corrosion possibility of reinforced steel which is exposed to partially or fully in marine environment for long years.

Keywords

References

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